<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

 <button id="btn1"></button>

<script type="text/javascript" src="js/util.js"></script>
<script>
   var oBtn = document.getElementById('btn1');
   myAddEvent(oBtn,'click',function () {
       alert("sss");
   })

</script>
</body>
</html>